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Polarization-sensitive optoionic membranes from chiral plasmonic nanoparticles.

Jiarong Cai^1,2, Wei Zhang^3,4, Liguang Xu^1,2,5

¹State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China.

Nature Nanotechnology

|March 15, 2022

Summary

Chiral nanoparticle films generate significant photocurrents, differentiating between right and left circularly polarized light. This breakthrough in chiral photonics offers new possibilities for sensitive optical sensors.

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Area of Science:

Optoelectronics
Materials Science
Nanotechnology

Background:

Direct photocurrent observation in chiral materials is challenging due to small optoelectronic effects.
Chiral metasurfaces enhance circular polarization sensitivity but have manufacturing and performance limitations.

Purpose of the Study:

To develop a highly sensitive method for detecting circular polarization using nanoporous thin films of chiral nanoparticles.
To investigate light-induced polarization-dependent ion accumulation for enhanced photocurrent generation.

Main Methods:

Fabrication of self-assembled multilayers of gold nanoparticles modified with L-phenylalanine.
Utilizing plasmonic coupling and planar chiroplasmonic modes for electron ejection.
Employing a phenylalanine layer to promote electron entrapment at the membrane-electrolyte interface.

Main Results:

Achieved a photocurrent difference of 2.41 times between right-handed and left-handed circularly polarized light.
Demonstrated high sensitivity to light ellipticity across all incident angles.
Observed phenomena mimicking polarization vision in marine animals.

Conclusions:

Nanoporous chiral nanoparticle films offer a simple and sensitive platform for circular polarization detection.
The developed optoionic membranes pave the way for miniaturized chiral photonic devices.
This approach enhances optoelectronic sensitivity to light polarization through ion accumulation mechanisms.